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Effect of cementation technique of individually formed fiber-reinforced composite post on bond strength and microleakage.

Makarewicz D, Le Bell-Rönnlöf AM, Lassila LV, Vallittu PK - Open Dent J (2013)

Bottom Line: The microleakage was measured using dye penetration depth under a stereomicroscope.Higher bond strength values (p<0.05) and less microleakage (p<0.05) were obtained with the "direct technique" compared to the "indirect technique".The "direct technique" seems to be beneficial when cementing individually formed FRC posts.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomaterials Science, Institute of Dentistry and BioCity Turku Biomaterials Research Program, University of Turku, FI-20520, Turku, Finland.

ABSTRACT

Objectives: The aim of this study was to evaluate the effect of two different cementation techniques of individually formed E-glass fiber-reinforced composite (FRC) post on bond strength and microleakage.

Methods: The crowns of extracted third molars were removed and post preparation was carried out with parapost drills (diameter 1.5 mm). After application of bonding agents individually formed FRC posts (everStick POST, diameter 1.5 mm) were cemented into the post spaces with either ParaCem®Universal or self-adhesive RelyX™Unicem, using two different cementation techniques: 1) an "indirect (traditional) technique" where the post was prepolymerized prior application of luting cement and insertion into the post space or 2) a "direct technique" where the uncured post was inserted to the post space with luting cement and light-polymerized in situ at the same time. After water storage of 48 hours, the roots (n = 10/group) were cut into discs of thickness of 2 mm. A push-out force was applied until specimen fracture or loosening of the post. A microleakage test was carried out on roots which were not subjected to the loading test (n= 32) to evaluate the sealing capacity of the post-canal interface. The microleakage was measured using dye penetration depth under a stereomicroscope.

Results: Higher bond strength values (p<0.05) and less microleakage (p<0.05) were obtained with the "direct technique" compared to the "indirect technique". None of the FRC posts revealed any dye penetration between the post and the cement.

Conclusions: The "direct technique" seems to be beneficial when cementing individually formed FRC posts.

No MeSH data available.


Related in: MedlinePlus

A setup of the custom-made jig for measuring the push-out force (modified from Le Bell et al 2005 [24]). 1= coronal layer, 2= apical layer.
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Figure 1: A setup of the custom-made jig for measuring the push-out force (modified from Le Bell et al 2005 [24]). 1= coronal layer, 2= apical layer.

Mentions: Four push-out test groups with 10 teeth each (n= 10/group) were prepared. The coronal part of the root specimen were wet ground to flat (grit 180 FEPA) and the root specimen were cut with a low-speed diamond saw (Leitz 1600 Saw Microtome) into discs of thickness of 2 mm (± 0.20 mm). The push-out force was measured by applying a force to the upper end of the post with a universal testing machine (Lloyd LRX, Lloyd Instruments Ltd, Fareham, UK) with a custom-made jig using a cross-head speed of 1.0 mm/min. Two discs of each root were measured (“1st layer”= coronal disc, “2nd layer”= apical disc) (Fig. 1). The force at the point of interfacial failure between the post, cement and dentin was observed from the loading curve. The force (Newton) required to debond the post from the dentin disc was registered for all posts. The push-out force (MPa) was calculated from the formula


Effect of cementation technique of individually formed fiber-reinforced composite post on bond strength and microleakage.

Makarewicz D, Le Bell-Rönnlöf AM, Lassila LV, Vallittu PK - Open Dent J (2013)

A setup of the custom-made jig for measuring the push-out force (modified from Le Bell et al 2005 [24]). 1= coronal layer, 2= apical layer.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3750973&req=5

Figure 1: A setup of the custom-made jig for measuring the push-out force (modified from Le Bell et al 2005 [24]). 1= coronal layer, 2= apical layer.
Mentions: Four push-out test groups with 10 teeth each (n= 10/group) were prepared. The coronal part of the root specimen were wet ground to flat (grit 180 FEPA) and the root specimen were cut with a low-speed diamond saw (Leitz 1600 Saw Microtome) into discs of thickness of 2 mm (± 0.20 mm). The push-out force was measured by applying a force to the upper end of the post with a universal testing machine (Lloyd LRX, Lloyd Instruments Ltd, Fareham, UK) with a custom-made jig using a cross-head speed of 1.0 mm/min. Two discs of each root were measured (“1st layer”= coronal disc, “2nd layer”= apical disc) (Fig. 1). The force at the point of interfacial failure between the post, cement and dentin was observed from the loading curve. The force (Newton) required to debond the post from the dentin disc was registered for all posts. The push-out force (MPa) was calculated from the formula

Bottom Line: The microleakage was measured using dye penetration depth under a stereomicroscope.Higher bond strength values (p<0.05) and less microleakage (p<0.05) were obtained with the "direct technique" compared to the "indirect technique".The "direct technique" seems to be beneficial when cementing individually formed FRC posts.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomaterials Science, Institute of Dentistry and BioCity Turku Biomaterials Research Program, University of Turku, FI-20520, Turku, Finland.

ABSTRACT

Objectives: The aim of this study was to evaluate the effect of two different cementation techniques of individually formed E-glass fiber-reinforced composite (FRC) post on bond strength and microleakage.

Methods: The crowns of extracted third molars were removed and post preparation was carried out with parapost drills (diameter 1.5 mm). After application of bonding agents individually formed FRC posts (everStick POST, diameter 1.5 mm) were cemented into the post spaces with either ParaCem®Universal or self-adhesive RelyX™Unicem, using two different cementation techniques: 1) an "indirect (traditional) technique" where the post was prepolymerized prior application of luting cement and insertion into the post space or 2) a "direct technique" where the uncured post was inserted to the post space with luting cement and light-polymerized in situ at the same time. After water storage of 48 hours, the roots (n = 10/group) were cut into discs of thickness of 2 mm. A push-out force was applied until specimen fracture or loosening of the post. A microleakage test was carried out on roots which were not subjected to the loading test (n= 32) to evaluate the sealing capacity of the post-canal interface. The microleakage was measured using dye penetration depth under a stereomicroscope.

Results: Higher bond strength values (p<0.05) and less microleakage (p<0.05) were obtained with the "direct technique" compared to the "indirect technique". None of the FRC posts revealed any dye penetration between the post and the cement.

Conclusions: The "direct technique" seems to be beneficial when cementing individually formed FRC posts.

No MeSH data available.


Related in: MedlinePlus